Safety lock



C. PIKE.

SAFETY LOCK.

APPLICATION FILED JAN. 22. 1921.

1,437,992 Patented Dec. 5,1922.

V INVENTUI? 2.52. 5.4 mar/e Pm wok/m Patented Dec. 5, 1922.

CHARLES PIKE, F BROOKLYN, NEW YORK.

SAFETY LOOK.

Application filed January 22, 1921. Serial No. 439,086.

To all whom it may concern: Be it known that I, CHARLES PIKE, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Safety Locks, of which the following is a specification.

The main object of this invention is the provision of a safety lock having few and simply constructed parts, and being operable only by one acquainted with the manner of operation even if he has the proper key.

The above and other objects will become apparent in the description below, in which like-named characters of reference refer to like-named parts in the drawings.

Referring briefly to the drawings, Fig. 1 is a side.view of the lock.

Fig. v2 is a perspective view of the keeper engageable by the lock bolt and which is secured to the door sash.

Fig. 3 is a plan View of the lock with the cover removed.

Fig. 4 is a side View of the lock and the key receiver, partly in section, showing the manner of attaching the lock.

Referring in detail to the drawings, the numeral 1 represents the lock frame and 2 a disc pivotally mounted therein about a stout pin 3, the sector being provided with a pair of oppositely disposed recesses 4 and having a number of gear teeth 5 of common construction, the tooth 6 being of the hooked form shown. A flat segment 6 is rotatably mounted about a pin 9, provided with a raised peripheral flange 7 on both sides and a straight chordal edge 6". A plurality of teeth 8 are formed in the curved portion of the segment, the flange 7 being cut away so that the teeth are protected on either side by a wall 7 A recess 10 is provided on the periphery of the segment 6, engaged by a detent 11 on the end of lever 12 pivotally mounted at 13 in the frame 1. Aspring 14 pressing the lever against the periphery of the segment 6 the lever having a lug 15 adapted to be engaged by the tooth 6 as will become apparent.

A spring 16 is mounted upon a pin in the casing 1, and is provided with a V- shaped bend adapted to engage the recesses 4. The segment 6 is adapted to enter the recess 19 of the keeper 18, which is attached to the door frame, and, in passing in an arc thru the recess, to engage the curved lugs 20 rigid with said keeper member and thus to retain a secure grip about said ears.

The door is represented at 21, a hole being bored therethru to receive the casing 25,. containing the keyhole and. common safety mechanism An annular cap 26 is screw-threaded'about the face end of the casing 25, the casing 25 being secured to the door by concealed screws 27; the latter may also be long enough to pass entirely thru the door and to screw into the casing 1.

A handle 22 is rigid with the pin or stem 3 inside the door, and the stem is hollowed to provide a compartment 29 within which 'long pin 39 extends from the outermost disc of the member 32 and is adapted to be engaged by a recess in the key 50.

The casing 25 is composed of two parts, abutting at the sh-oulder 35, and a stem 37, integral with the frame 1, engages a shoulder 36 in the member 25 in supporting the latter, the stem having spaced notches 38. The pin 9 is secured to the casing 1 by two screws, 23 and 24, entering the latter thru opposite sides of the frame, thus necessitating the removal of both screws before the member 6 may be loosened from its pivot.

The operation of the lock may now be described. On insertion of the key 50, the pin 39 engages the aforementioned recess in the key. Mere turning of the key, it is apparent, will not open the lock, for the member 32 will then be turned freely without engaging the member 31. Therefore, it is necessary as the next step to force the key inward and slightly turn the same so as to engage the pins 33 and 34 with the opposite slots mentioned. Then proper turning of the kev will cause the disc 2 to be rotated and consequently the segment 6 will be withdrawn from the keeper membr 18.

In order to provide for fitting the lock to doors of various thicknesses, the casing 25 is in two parts. If, for instance, the lock shown is to be aflixed to a door of, lesser thickness than that shown, the end piece of the stem 37 is broken oil at the first notch 37, and the outer portion of the casing 25 is pushed in the same distance by virtue of the telescopic engagement of the inner and outer portions of the casing, as shown,

The end of the stem 37, left by removal of the former end portion, then engages the shoulder Further, one or more of the plates 32 may also he removed a like distance. With such provisions the lock may be adapted to a door of any thickness with out alterin the standard construction of the lock.

It is to he noted that the lock cannot be onened even it the disc be disengaged from e segment should such occurrence take place) I claim:

A lock comprising a casing and a keeper as /n92 having a straight-fiat face containing a slot, rearwardly extending arcuate lugs on each side of the cent *r of the slot, a segment revoluble in said casing said segment having flanges on its rim adapted to engage in said keeper and a chordal edge registerable With the end of the casing through Which the rim may be protruded, a detent for said segment, teeth in the periphery of said segment a disc having teeth engaging the segment, a lug on said disc, means formed With said segmentengageable with said lug whereby the segment is prevented from turning unless the disc he rotated in advance; means for holding said disc in each of its extreme positions, means for manually actuating said disc, and a key operating means for the disc.

In Witness whereof I afiix my signature.

CHARLES PIKE. 

